This is a prediction I have adapted and changed, so don't panic if your questions vary and questions are not in right order but I ensure you the marks are all there, if not this is all from memory remember, play nice and enjoy [*] - Indicated my side comments

2) Shapes of Molecules questions;
- BF3 (should resemble a trigonal planar shape OR t-shaped (since a previous mark scheme allows both), incorporated with two lone pairs) (1 mark)
- Angle *There is debate with this so these are what most people have said
- 120 (115-120) OR 90 (85-90) (1 mark)

4) Volume question, to be converted from cm3 to m3 s
PV = nRT or V = nRT/P (1 mark)
Correctly changing 101kpa to 101,000 pa & cm3 to m3 by x by (10 to the power of -6) (1 mark)
Answer is 0.0260 (1 marks) *If you got 0.0175, or something like that it is because you forgot to convert cm3 tom3 or didnt convert it properly but all is not lost, since you get marks for working out

. Calculation questions for Volume of Nitric acid = 0.0524 dm3

*my working out:
8.14 / 207.2 = 0.0393
Then to get moles of n02 you times by 8/3 (due to 3:8 ratio)
so 0.0393 x 8/3 = 0.1048 moles of n02 ( 2 marks - for correct working out)

14) Why does Carbon have a high melting point?
Macromolecular (1 mark)
Each carbon is covalently bonded to four other carbons (making a tetrahedral shake), networking throughout structure (1 mark)Strong Covalent bonds ( 1 mark)
Alot of energy is required to overcome/break bonds (1 mark)

15) Completing Graph for Nitrogen
Nitrogen should be plotted with an X, lower than all other elements but NOT on 0.
( 1 mark)

16) What raw material is Hexane Obtained from?
Crude Oil ( 1 mark)

17)
. What substance/material would be used to remove Sulphur
CaO (Calcium Oxide) or CaCO3 (Limstone) ( 1 mark)
. Why is this used?
If you used CaO - It neutralised acid in Sulphur impurity (there is debate for this, I didnt personally use Ca0 so cannot give judgement) (1 mark)
. If used CaCO3 - Limestone can be easily accessed/high in abundance/ there is high supply (1 mark)

19) Which type of Cracking produces high % of Alkenes?
- Thermal Cracking ( 1 mark)
State conditions required
- High Temperate and Pressure ( 1 mark)*You could also gain these marks if you said the actual temperature and pressure required

20) State why Zeolite/Catalyst is used in Catalytic converters
- (Extremely) Large surface area for reaction to take place (1 mark)

. Give reasons why your Ar is different to that of the periodic table (1 mark)*Again there is debate; so these are the 2 most logical answers people gave
- Mass Spectrometer used for Ar in Periodic table was of a higher resolution than that given in the table therefore answer is more precise/accurate
OR
- Fragments may of fallen off before ions reached detector

(The reason I havent included the meteorite answers because Krpton is the same whatever planet, adding meteorite was just a way of applying knowledge to real-life situations it didn't play any real part in the question for example "Sanjeev and Alice did an experiment" you wouldnt say Sanjeev is more reliable simple because he a boy?, the fact the krpton was apart of the meteorite was a decoy it played no part.)

29) Why it is not possible to get pure N0 on its own? (1 mark)*There is debate with this answer; I have been suggested the most and make the most logical sense

- NO reacts with water (vapour) in air to form H2N03 (Nitric Acid)
OR
- NO reacts with air to form Nitrogen Dioxide?
OR
- NO was not only gaseous product so may of reacted with 02 to form N03 which may be hard to seperate?*predictions here people(- The reason why 'N0 escpaing into air' wont be accepted is because, you havent explained how that makes it impure? If the question was why can N0 not be 100% obtained/collected which is the next question then that answer would would but its talking about purity.)

. Why is it not possible to get 100% yield of N0 (1 mark)
- Not high enough Temperature/Pressure for Lead Nitrate to completely decompose
OR
- N0 make escape into air, due to being a gas

There was also an equation for write equation for incomplete/complete combustion of an Octane
(cant remember)
but this was (1 mark)

Giant ionic structure. Strong oppositely charged ions keep structure together, lots of energy required to overcome these forces. (3 marks; 1 for giant ionic structure, 1 for strong forces of opp charged ions, 1 for overcoming forces )*Myself and others believe that if you said just Ionic bonding instead of Gian Ionic strcuture, you can still get 3 marks since the question asked 'in terms of bonding' so stating the structure wouldnt be needed.

Q) PV= nRT question

0.0175 ( 4marks)

Q) Which element has smallest atomic radii ?

Lithium ( 1 mark )

Q) how does atomic radii change across a period in period 2
Decreases*many people are saying they asked why, but I assure you they did not

Q) Label for HCl.
corrosive, toxic, irritant (1 mark)

Q) Nitride ion with same electronic configuration as 1s2 2s2 2p6?

N 3- ion ( 1mark )

Q) Element Q

F- ion ( 1 mark )

Q) question that follows after F- ion question; Li3N ??? (1 mark)

Q) empirical formula of Calcium nitride.

Ca3N2 (3 mark; 2 for appropriate method, 1 for answer)

Q) Balancing lead nitrate equation

2 2 4 1 ( 1 mark ) ( multiples are accepted )
[COLOR="rgb(75, 0, 130)"]*myself and others believe that you can still get full mark if you didnt state a 1 infront of the 02, since it goes without saying[/COLOR]
Q) Environmental dangers of Sulfur compounds

Readily forms strong covalent bonds with 4 other carbon atoms, forming giant covalent structure. These strong covalent bonds spread throughout the structure and they MUST be broken. Require a lot of energy to break these strong forces. ( 3 marks; 1 mark for readily forms bonds with 4 other C atoms, 1 for giant covalent structure or macromolecular, 1 for strong bonds must be broken, 1 for require a lot of energy to break )
[COLOR="rgb(75, 0, 130)"]*I also mentioned tetrahedral like structure[/COLOR]

Q) Cross for nitrogen

Nitrogen in the graph should appear lower than all other elements plotted (1 mark)

Q) which raw material is hexane obtained from ?

Crude oil (1 mark )

Q) How to remove sulfur ?

React with CaO, neutralises sulfur. ( 2 marks )*However some mentioned CaC03 (limestone) and reason because it is easily accesible/high in abundance/can be easily collected

Q) State a catalyst used in exausht pipes to remove NO and CO and explain the benefit of having honey comb structure ??

Rh/Pt/Pl , Increased surface area for reaction. ( 2 marks )

Q) Number of isomers ?

5 ( 1 mark )

Q) name of compound shown ?

2,2-dichloro,3-methylpentane ( 1mark )

Q) empirical formula of compound shown ?

C3H6Cl ( 1mark )

Q) how is Kr ionised ?
Krypton is ionised by electron gun that fires electron at high speed at gaseous sample of Kr atom knocking an e- out by repulsion. (3marks)

Q) Ar of Kr in sample = 84.0 (4marks)
*needed a .0 as question stated in one decimal place.

Q) why is the value of Ar you obtained different from periodic table ?
Argument for this,

One view: Something about space, so different values
Second view: (which I put) Mass spectrometer used for periodic table may be of high resolution so more precise/accurate
Third view: something about different isotopes

Q) IE change for 1st IE of Krypton.

Kr(g) + e- -> Kr+(g) + e-

Or

Kr(g) -> Kr+(g) + e- (2marks; 1 for states, 1 for correct equation)

Q) which element deviates from general trend of first IE in period 2 ?. Explain why.

Boron, electron in 2p orbital, Beryllium has electron in 2s orbital. 2p is of slightly higher energy than 2s orbital, less shielding, less energy required to remove. ( 3marks )

Q) Explain peak at 42,

I said: Krpton may of been ionisied to form 2+ charge which is rare/occurs less likely so abundance is smaller and also M/Z is smaller/ behaves as a ion half its mass
(2marks)

isn't square planar 90 and trigonal bipyramidal 120? i somehow got 120 degrees even though I misread the chemical, thought it was bf3 and did trigonal planar, god damn I really cannot be bothered resitting this -___________________-

I estimated 49/70.. really wanted an A man.. thanks for the post though!

(Original post by PowerPuff)
That didnt make sense,
They didnt ask anything to do with why/how their was a trend for atomic size,
it simple asked which element had the larget atomic size, and moved on.

Agreed, and also they're not the same thing. Once wants an explanation one wants to know which element.

There was also one, just after the crude oil question, regarding what the process is called with the answer been Fractional Distillation.

Also, even if he did use most of your mark scheme, he's made it more accessible to people.

I made some silly mistakes, I'll be happy with a B I might JUST scrape an A if the boundaries are low.

(Original post by PowerPuff)
That didnt make sense,
They didnt ask anything to do with why/how their was a trend for atomic size,
it simple asked which element had the larget atomic size, and moved on.

(Original post by iAre Teh Lejend)
No I created the markscheme dude... and who cares whether they asked why or how,same thing dude people doing a-level chem should have brains to work that out,mehhhhh

I think iAre Teh Lejend should get credit for actually producing the mark scheme and Powerpuff can get credit for editing. It's only fair that way since he did actually make it first.